The scheme is the UK standard for museums and galleries and defines good practice for management, provision of services and care of collections.
Currently just under 1,800 museums, including many other National Trust properties, participate in the scheme.
‘We’re very proud to be a fully accredited museum as part of a scheme that is regarded as one of the most innovative and effective developments in the sector,’ said manager Sarah Spurrier.
“The workhouse is constantly evolving so we hope visitors will be able to experience something different on every visit.”
The Workhouse was built in 1824 as a place of last resort for the poor and needy.
Created by Rev JT Becher, the Workhouse at Southwell was influenced by prison design and its harsh regime became a blueprint for workhouses throughout the country.
Pictured is conservation officer Fiona Lewin, holding the accreditation certificate.